Mám podobný problém. V logu mám
Oct 1 23:32:12 domena postfix/smtpd[1656]: connect from mxh1.seznam.cz[77.75.72.26]
Oct 1 23:32:12 domena postfix/smtpd[1656]: warning: non-null host address bits in "10.200.1.0/16", perhaps you should use "10.200.0.0/16" instead
Oct 1 23:32:12 domena postfix/smtpd[1656]: warning: non-null host address bits in "10.200.1.0/16", perhaps you should use "10.200.0.0/16" instead
Oct 1 23:32:12 domena postfix/smtpd[1656]: NOQUEUE: reject: CONNECT from mxh1.seznam.cz[77.75.72.26]: 451 4.3.0 <mxh1.seznam.cz[77.75.72.26]>: Temporary lookup failure; proto=SMTP
Oct 1 23:32:12 domena postfix/smtpd[1656]: warning: non-null host address bits in "10.200.1.0/16", perhaps you should use "10.200.0.0/16" instead
Oct 1 23:32:12 domena postfix/smtpd[1656]: disconnect from mxh1.seznam.cz[77.75.72.26]
a main.cf mám nastaven takto:virtual_mailbox_domains = proxy:mysql:/etc/postfix/sql/mysql_virtual_domains_maps.cf
virtual_alias_maps =
proxy:mysql:/etc/postfix/sql/mysql_virtual_alias_maps.cf,
proxy:mysql:/etc/postfix/sql/mysql_virtual_alias_domain_maps.cf,
proxy:mysql:/etc/postfix/sql/mysql_virtual_alias_domain_catchall_maps.cf
virtual_mailbox_maps =
proxy:mysql:/etc/postfix/sql/mysql_virtual_mailbox_maps.cf,
proxy:mysql:/etc/postfix/sql/mysql_virtual_alias_domain_mailbox_maps.cf
virtual_transport = dovecot
virtual_minimum_uid = 999
virtual_uid_maps = static:999
virtual_gid_maps = static:999
smtpd_helo_restrictions = permit_mynetworks, reject_invalid_hostname
smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated
smtpd_sender_restrictions = permit_mynetworks, reject_unknown_sender_domain
smtpd_recipient_restrictions = permit_mynetworks,
permit_sasl_authenticated,
reject_unknown_sender_domain,
reject_unknown_recipient_domain,
reject_unlisted_recipient,
reject_unauth_destination,
reject_unauth_pipelining
default_destination_concurrency_limit = 1
local_destination_concurrency_limit = 1
dovecot_destination_concurrency_limit = 1
dovecot_destination_recipient_limit = 1
disable_vrfy_command=yes
strict_rfc821_envelopes=yes
smtpd_soft_error_limit=5
smtpd_hard_error_limit=10
smtpd_helo_required=yes
smtpd_delay_reject=no
maximal_queue_lifetime = 6d
delay_warning_time = 8h
biff = no
enable_original_recipient = yes
append_at_myorigin = yes
smtpd_sasl_auth_enable = yes
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_local_domain = localhost
smtpd_sasl_security_options = noanonymous
smtpd_sasl_tls_security_options = noanonymous
smtpd_sasl_authenticated_header = yes
broken_sasl_auth_clients = yes
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
append_dot_mydomain = no
readme_directory = no
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
myhostname = domena.cz
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = domena.cz
mydestination =
relayhost =
mynetworks = 127.0.0.0/8, 10.200.1.0/16, 10.0.1.0/24,10.200.15.2
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
Jinak server obstarává NAT, k ISP je připojen rozhraním 192.168.3.100, ale v logu se objevuje vnitřní adresa.